bigsmp_32.c

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/*
 * APIC driver for "bigsmp" xAPIC machines with more than 8 virtual CPUs.
 *
 * Drives the local APIC in "clustered mode".
 */
#include <linux/threads.h>
#include <linux/cpumask.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/dmi.h>
#include <linux/smp.h>

#include <asm/apicdef.h>
#include <asm/fixmap.h>
#include <asm/mpspec.h>
#include <asm/apic.h>
#include <asm/ipi.h>

static unsigned bigsmp_get_apic_id(unsigned long x)
{
    return (x >> 24) & 0xFF;
}

static int bigsmp_apic_id_registered(void)
{
    return 1;
}

static unsigned long bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
{
    return 0;
}

static unsigned long bigsmp_check_apicid_present(int bit)
{
    return 1;
}

static int bigsmp_early_logical_apicid(int cpu)
{
    /* on bigsmp, logical apicid is the same as physical */
    return early_per_cpu(x86_cpu_to_apicid, cpu);
}

static inline unsigned long calculate_ldr(int cpu)
{
    unsigned long val, id;

    val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
    id = per_cpu(x86_bios_cpu_apicid, cpu);
    val |= SET_APIC_LOGICAL_ID(id);

    return val;
}

/*
 * Set up the logical destination ID.
 *
 * Intel recommends to set DFR, LDR and TPR before enabling
 * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
 * document number 292116).  So here it goes...
 */
static void bigsmp_init_apic_ldr(void)
{
    unsigned long val;
    int cpu = smp_processor_id();

    apic_write(APIC_DFR, APIC_DFR_FLAT);
    val = calculate_ldr(cpu);
    apic_write(APIC_LDR, val);
}

static void bigsmp_setup_apic_routing(void)
{
    printk(KERN_INFO
        "Enabling APIC mode:  Physflat.  Using %d I/O APICs\n",
        nr_ioapics);
}

static int bigsmp_cpu_present_to_apicid(int mps_cpu)
{
    if (mps_cpu < nr_cpu_ids)
        return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);

    return BAD_APICID;
}

static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
{
    /* For clustered we don't have a good way to do this yet - hack */
    physids_promote(0xFFL, retmap);
}

static int bigsmp_check_phys_apicid_present(int phys_apicid)
{
    return 1;
}

static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
{
    return cpuid_apic >> index_msb;
}

static inline void bigsmp_send_IPI_mask(const struct cpumask *mask, int vector)
{
    default_send_IPI_mask_sequence_phys(mask, vector);
}

static void bigsmp_send_IPI_allbutself(int vector)
{
    default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
}

static void bigsmp_send_IPI_all(int vector)
{
    bigsmp_send_IPI_mask(cpu_online_mask, vector);
}

static int dmi_bigsmp; /* can be set by dmi scanners */

static int hp_ht_bigsmp(const struct dmi_system_id *d)
{
    printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
    dmi_bigsmp = 1;

    return 0;
}


static const struct dmi_system_id bigsmp_dmi_table[] = {
    { hp_ht_bigsmp, "HP ProLiant DL760 G2",
        {   DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
            DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
        }
    },

    { hp_ht_bigsmp, "HP ProLiant DL740",
        {   DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
            DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
        }
    },
    { } /* NULL entry stops DMI scanning */
};

static int probe_bigsmp(void)
{
    if (def_to_bigsmp)
        dmi_bigsmp = 1;
    else
        dmi_check_system(bigsmp_dmi_table);

    return dmi_bigsmp;
}

static struct apic apic_bigsmp = {

    .name               = "bigsmp",
    .probe              = probe_bigsmp,
    .acpi_madt_oem_check        = NULL,
    .apic_id_valid          = default_apic_id_valid,
    .apic_id_registered     = bigsmp_apic_id_registered,

    .irq_delivery_mode      = dest_Fixed,
    /* phys delivery to target CPU: */
    .irq_dest_mode          = 0,

    .target_cpus            = default_target_cpus,
    .disable_esr            = 1,
    .dest_logical           = 0,
    .check_apicid_used      = bigsmp_check_apicid_used,
    .check_apicid_present       = bigsmp_check_apicid_present,

    .vector_allocation_domain   = default_vector_allocation_domain,
    .init_apic_ldr          = bigsmp_init_apic_ldr,

    .ioapic_phys_id_map     = bigsmp_ioapic_phys_id_map,
    .setup_apic_routing     = bigsmp_setup_apic_routing,
    .multi_timer_check      = NULL,
    .cpu_present_to_apicid      = bigsmp_cpu_present_to_apicid,
    .apicid_to_cpu_present      = physid_set_mask_of_physid,
    .setup_portio_remap     = NULL,
    .check_phys_apicid_present  = bigsmp_check_phys_apicid_present,
    .enable_apic_mode       = NULL,
    .phys_pkg_id            = bigsmp_phys_pkg_id,
    .mps_oem_check          = NULL,

    .get_apic_id            = bigsmp_get_apic_id,
    .set_apic_id            = NULL,
    .apic_id_mask           = 0xFF << 24,

    .cpu_mask_to_apicid_and     = default_cpu_mask_to_apicid_and,

    .send_IPI_mask          = bigsmp_send_IPI_mask,
    .send_IPI_mask_allbutself   = NULL,
    .send_IPI_allbutself        = bigsmp_send_IPI_allbutself,
    .send_IPI_all           = bigsmp_send_IPI_all,
    .send_IPI_self          = default_send_IPI_self,

    .trampoline_phys_low        = DEFAULT_TRAMPOLINE_PHYS_LOW,
    .trampoline_phys_high       = DEFAULT_TRAMPOLINE_PHYS_HIGH,

    .wait_for_init_deassert     = default_wait_for_init_deassert,

    .smp_callin_clear_local_apic    = NULL,
    .inquire_remote_apic        = default_inquire_remote_apic,

    .read               = native_apic_mem_read,
    .write              = native_apic_mem_write,
    .eoi_write          = native_apic_mem_write,
    .icr_read           = native_apic_icr_read,
    .icr_write          = native_apic_icr_write,
    .wait_icr_idle          = native_apic_wait_icr_idle,
    .safe_wait_icr_idle     = native_safe_apic_wait_icr_idle,

    .x86_32_early_logical_apicid    = bigsmp_early_logical_apicid,
};

void __init generic_bigsmp_probe(void)
{
    unsigned int cpu;

    if (!probe_bigsmp())
        return;

    apic = &apic_bigsmp;

    for_each_possible_cpu(cpu) {
        if (early_per_cpu(x86_cpu_to_logical_apicid,
                  cpu) == BAD_APICID)
            continue;
        early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
            bigsmp_early_logical_apicid(cpu);
    }

    pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
}

apic_driver(apic_bigsmp);